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ClassEnhancer (Oracle - Berkeley DB Java API)
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com.sleepycat.persist.model</FONT>
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Class ClassEnhancer</H2>
<PRE>
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A>
  <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.sleepycat.persist.model.ClassEnhancer</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/instrument/ClassFileTransformer.html" title="class or interface in java.lang.instrument">ClassFileTransformer</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public class <B>ClassEnhancer</B><DT>extends <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A><DT>implements <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/instrument/ClassFileTransformer.html" title="class or interface in java.lang.instrument">ClassFileTransformer</A></DL>
</PRE>

<P>
Enhances the bytecode of persistent classes to provide efficient access to
 fields and constructors, and to avoid special security policy settings for
 accessing non-public members.  Classes are enhanced if they are annotated
 with <A HREF="../../../../com/sleepycat/persist/model/Entity.html" title="annotation in com.sleepycat.persist.model"><CODE>Entity</CODE></A> or <A HREF="../../../../com/sleepycat/persist/model/Persistent.html" title="annotation in com.sleepycat.persist.model"><CODE>Persistent</CODE></A>.

 <p><code>ClassEnhancer</code> objects are thread-safe.  Multiple threads may
 safely call the methods of a shared <code>ClassEnhancer</code> object.</p>

 <p>As described in the <a
 href="../package-summary.html#bytecode">package summary</a>, bytecode
 enhancement may be used either at runtime or offline (at build time).</p>

 <p>To use enhancement offline, this class may be used as a <A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#main(java.lang.String[])"><CODE>main
 program</CODE></A>.
 </p>

 <p>For enhancement at runtime, this class provides the low level support
 needed to transform class bytes during class loading.  To configure runtime
 enhancement you may use one of the following approaches:</p>
 <ol>
 <li>For Java 1.5, the <code>je-&lt;version&gt;.jar</code> file may be used as an instrumentation
 agent as follows:
 <pre class="code">java -javaagent:lib/je-&lt;version&gt;.jar=enhance:packageNames ...</pre>
 <code>packageNames</code> is a comma separated list of packages containing
 persistent classes.  Sub-packages of these packages are also searched.  If
 <code>packageNames</code> is omitted then all packages known to the current
 classloader are searched.
 <p>The "-v" option may be included in the comma separated list to print the
 name of each class that is enhanced.</p></li>
 <br>
 <li>The <A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#enhance(java.lang.String, byte[])"><CODE>enhance(java.lang.String, byte[])</CODE></A> method may be called to implement a class loader
 that performs enhancement.  Using this approach, it is the developer's
 responsibility to implement and configure the class loader.</li>
 </ol>
<P>

<P>
<HR>

<P>

<!-- ======== CONSTRUCTOR SUMMARY ======== -->

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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#ClassEnhancer()">ClassEnhancer</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Creates a class enhancer that searches all packages.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#ClassEnhancer(java.util.Set)">ClassEnhancer</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Set.html" title="class or interface in java.util">Set</A>&lt;<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A>&gt;&nbsp;packageNames)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Creates a class enhancer that searches a given set of packages.</TD>
</TR>
</TABLE>
&nbsp;
<!-- ========== METHOD SUMMARY =========== -->

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<B>Method Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;byte[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#enhance(java.lang.String, byte[])">enhance</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A>&nbsp;className,
        byte[]&nbsp;classBytes)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Enhances the given class bytes if the class is annotated with <A HREF="../../../../com/sleepycat/persist/model/Entity.html" title="annotation in com.sleepycat.persist.model"><CODE>Entity</CODE></A> or <A HREF="../../../../com/sleepycat/persist/model/Persistent.html" title="annotation in com.sleepycat.persist.model"><CODE>Persistent</CODE></A>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#getVerbose()">getVerbose</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gets verbose mode.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#main(java.lang.String[])">main</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A>[]&nbsp;args)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Enhances classes in the directories specified.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#premain(java.lang.String, java.lang.instrument.Instrumentation)">premain</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A>&nbsp;args,
        <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/instrument/Instrumentation.html" title="class or interface in java.lang.instrument">Instrumentation</A>&nbsp;inst)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Enhances classes as specified by a JVM -javaagent argument.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#setVerbose(boolean)">setVerbose</A></B>(boolean&nbsp;verbose)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sets verbose mode.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;byte[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#transform(java.lang.ClassLoader, java.lang.String, java.lang.Class, java.security.ProtectionDomain, byte[])">transform</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/ClassLoader.html" title="class or interface in java.lang">ClassLoader</A>&nbsp;loader,
          <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A>&nbsp;className,
          <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.html" title="class or interface in java.lang">Class</A>&lt;?&gt;&nbsp;classBeingRedefined,
          <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/security/ProtectionDomain.html" title="class or interface in java.security">ProtectionDomain</A>&nbsp;protectionDomain,
          byte[]&nbsp;classfileBuffer)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
</TR>
</TABLE>
&nbsp;
<P>

<!-- ========= CONSTRUCTOR DETAIL ======== -->

<A NAME="constructor_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Constructor Detail</B></FONT></TH>
</TR>
</TABLE>

<A NAME="ClassEnhancer()"><!-- --></A><H3>
ClassEnhancer</H3>
<PRE>
public <B>ClassEnhancer</B>()</PRE>
<DL>
<DD>Creates a class enhancer that searches all packages.
<P>
</DL>
<HR>

<A NAME="ClassEnhancer(java.util.Set)"><!-- --></A><H3>
ClassEnhancer</H3>
<PRE>
public <B>ClassEnhancer</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Set.html" title="class or interface in java.util">Set</A>&lt;<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A>&gt;&nbsp;packageNames)</PRE>
<DL>
<DD>Creates a class enhancer that searches a given set of packages.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>packageNames</CODE> - a set of packages to search for persistent
 classes.  Sub-packages of these packages are also searched.  If empty or
 null, all packages known to the current classloader are searched.</DL>
</DL>

<!-- ============ METHOD DETAIL ========== -->

<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Method Detail</B></FONT></TH>
</TR>
</TABLE>

<A NAME="main(java.lang.String[])"><!-- --></A><H3>
main</H3>
<PRE>
public static void <B>main</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A>[]&nbsp;args)
                 throws <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Exception.html" title="class or interface in java.lang">Exception</A></PRE>
<DL>
<DD>Enhances classes in the directories specified.  The class files are
 replaced when they are enhanced, without changing the file modification
 date.  For example:

 <pre class="code">java -cp je-&lt;version&gt;.jar com.sleepycat.persist.model.ClassEnhancer ./classes</pre>

 <p>The "-v" argument may be specified to print the name of each class
 file that is enhanced.  The total number of class files enhanced will
 always be printed.</p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>args</CODE> - one or more directories containing classes to be enhanced.
 Subdirectories of these directories will also be searched.  Optionally,
 -v may be included to print the name of every class file enhanced.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Exception.html" title="class or interface in java.lang">Exception</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="premain(java.lang.String, java.lang.instrument.Instrumentation)"><!-- --></A><H3>
premain</H3>
<PRE>
public static void <B>premain</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A>&nbsp;args,
                           <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/instrument/Instrumentation.html" title="class or interface in java.lang.instrument">Instrumentation</A>&nbsp;inst)</PRE>
<DL>
<DD>Enhances classes as specified by a JVM -javaagent argument.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>See Also:</B><DD><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/instrument/package-summary.html"><CODE>java.lang.instrument</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="setVerbose(boolean)"><!-- --></A><H3>
setVerbose</H3>
<PRE>
public void <B>setVerbose</B>(boolean&nbsp;verbose)</PRE>
<DL>
<DD>Sets verbose mode.

 <p>True may be specified to print the name of each class file that is
 enhanced.  This property is false by default.</p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getVerbose()"><!-- --></A><H3>
getVerbose</H3>
<PRE>
public boolean <B>getVerbose</B>()</PRE>
<DL>
<DD>Gets verbose mode.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>See Also:</B><DD><A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#setVerbose(boolean)"><CODE>setVerbose(boolean)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="transform(java.lang.ClassLoader, java.lang.String, java.lang.Class, java.security.ProtectionDomain, byte[])"><!-- --></A><H3>
transform</H3>
<PRE>
public byte[] <B>transform</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/ClassLoader.html" title="class or interface in java.lang">ClassLoader</A>&nbsp;loader,
                        <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A>&nbsp;className,
                        <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.html" title="class or interface in java.lang">Class</A>&lt;?&gt;&nbsp;classBeingRedefined,
                        <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/security/ProtectionDomain.html" title="class or interface in java.security">ProtectionDomain</A>&nbsp;protectionDomain,
                        byte[]&nbsp;classfileBuffer)</PRE>
<DL>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/instrument/ClassFileTransformer.html#transform(java.lang.ClassLoader, java.lang.String, java.lang.Class, java.security.ProtectionDomain, byte[])" title="class or interface in java.lang.instrument">transform</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/instrument/ClassFileTransformer.html" title="class or interface in java.lang.instrument">ClassFileTransformer</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="enhance(java.lang.String, byte[])"><!-- --></A><H3>
enhance</H3>
<PRE>
public byte[] <B>enhance</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A>&nbsp;className,
                      byte[]&nbsp;classBytes)</PRE>
<DL>
<DD>Enhances the given class bytes if the class is annotated with <A HREF="../../../../com/sleepycat/persist/model/Entity.html" title="annotation in com.sleepycat.persist.model"><CODE>Entity</CODE></A> or <A HREF="../../../../com/sleepycat/persist/model/Persistent.html" title="annotation in com.sleepycat.persist.model"><CODE>Persistent</CODE></A>.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>className</CODE> - the class name in binary format; for example,
 "my.package.MyClass$Name", or null if no filtering by class name
 should be performed.<DD><CODE>classBytes</CODE> - are the class file bytes to be enhanced.
<DT><B>Returns:</B><DD>the enhanced bytes, or null if no enhancement was performed.</DL>
</DD>
</DL>
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